Okay so I got an RS4 clutch, new chip, miltek exhaust, new diverter valves, ghb blow off valves, and cold air intake. Everytime I gun it and it gets into higher revs it makes this reaaally annoying screeching noise like a dentists drill or something. I also noticed it makes the noise at higher revs when the gas tank is full. Anyone have any idea whats up?
Its been running well (74k miles), sometimes i just feel like i'm not getting the power I had expected.
My pops has an RS6 actually, it does rule quite hard but I love my s4 and I just want to cure its ailments.

Usually turbos will have a "dentist drill" sound.

Your car will consume oil and usually produce blue smoke out of the exhaust.

Jason